const std = @import("std"); const io = std.io; const str = std.str; // TODO var args printing pub fn main(args: [][]u8) -> %void { const exe = args[0]; var catted_anything = false; for (args[1...]) |arg| { if (str.eql(arg, "-")) { catted_anything = true; cat_stream(io.stdin) %% |err| return err; } else if (arg[0] == '-') { return usage(exe); } else { var is: io.InStream = undefined; is.open(arg) %% |err| { %%io.stderr.printf("Unable to open file: "); %%io.stderr.printf(@errorName(err)); %%io.stderr.printf("\n"); return err; }; defer %%is.close(); catted_anything = true; cat_stream(is) %% |err| return err; } } if (!catted_anything) { cat_stream(io.stdin) %% |err| return err; } io.stdout.flush() %% |err| return err; } fn usage(exe: []u8) -> %void { %%io.stderr.printf("Usage: "); %%io.stderr.printf(exe); %%io.stderr.printf(" [FILE]...\n"); return error.Invalid; } fn cat_stream(is: io.InStream) -> %void { var buf: [1024 * 4]u8 = undefined; while (true) { const bytes_read = is.read(buf) %% |err| { %%io.stderr.printf("Unable to read from stream: "); %%io.stderr.printf(@errorName(err)); %%io.stderr.printf("\n"); return err; }; if (bytes_read == 0) { break; } io.stdout.write(buf[0...bytes_read]) %% |err| { %%io.stderr.printf("Unable to write to stdout: "); %%io.stderr.printf(@errorName(err)); %%io.stderr.printf("\n"); return err; }; } }